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Fencer Vulns
medium 4.7

CVE-2026-93981 json

hono/jsx before 4.13.7 Cross-Site Scripting via Unescaped Strings

published 2026-09-19 50 d ago modified 2026-10-01 39 d ago also GHSA-hxh3-vqpv-xpqv , EUVD-2026-83586

cvss
4.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits
0
none known

Summary

hono before 4.13.7 fails to HTML-escape plain strings rendered by hono/jsx as a child or fallback of Suspense, as a string child of ErrorBoundary alongside an asynchronous sibling, as the single child of a Context.Provider, or as the root value passed to renderToString() or renderToReadableStream() from hono/jsx/dom/server. These paths stringify their input and treat the result as already-escaped markup, so an attacker who controls such a string during server-side rendering can inject arbitrary HTML and execute script under the application's origin.

Patch / fix

  • npm hono 4.13.7
  • honojs hono 4.13.7
  • grafana13.1 hummingbird 1 13.1.6-0.6.hum1
  • grafana12.4 hummingbird 1 12.4.10-0.10.hum1
  • grafana13.1 hummingbird 1 13.1.6-0.5.hum1
  • grafana13.2 hummingbird 1 13.2.1-0.7.hum1

red hat advisories RHSA-2026:74869RHSA-2026:73654RHSA-2026:73655RHSA-2026:71906

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-93981 updated cvss 4.7

hono: hono/jsx: Cross-Site Scripting via Unescaped Strings

  • Red Hat Migration Toolkit for Applications 8 mta/mta-solution-server-rhel9 Red Hat Ansible Automation Platform 2 ansible-automation-platform-27/mcp-server-rhel9, ansible-automation-platform-tech-preview/mcp-server-rhel9 Red Hat Enterprise Linux 10 grafana 12.4.3-2.el10 Red Hat OpenShift AI (RHOAI) rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9 Red Hat OpenShift Dev Spaces devspaces/code-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images grafana13.1 13.1.6-0.5.hum1, grafana13.1 13.1.6-0.6.hum1, grafana13.2 13.2.1-0.7.hum1, grafana12.4 12.4.10-0.10.hum1
    fixed: vendor fix RHSA-2026:73654

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
48 d ago

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 2.3 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
CNA 3.1 4.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA 4.0 2.3 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
GitHub 3.1 4.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
npm hono
<4.13.7
4.13.7

Affected products

  • honojs hono

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.